My friends and I pulled up our cars together (M6, M3, 335is) and we compared our exhaust note. The M6's exhaust note was the loudest and best sounding. The 335is also was A LOT and i mean A LOT louder than the M3's. Im not saying it sounded better but some people in the forum claims that's not true so i called up my buddies and we did a comparision. The exhaust noise from the M3 is really quiet compared to the 335is, period.

I find the exhaust on my 2011 is noticeably louder and deeper than on my 2010. It annoys my wife . At the last track day, one of the Marshals is a BMW tech and he noted how much louder the intake and exhaust sounds on my car compared to the other, older, M3s that were there. He speculated, although who knows for sure, that BMW must have changed something for 2011. I'm not convinced they did but my exhaust is notably deeper and louder. It has actually taken away the exhaust upgrade bug I had with the last M3.

I find the exhaust on my 2011 is noticeably louder and deeper than on my 2010. It annoys my wife . At the last track day, one of the Marshals is a BMW tech and he noted how much louder the intake and exhaust sounds on my car compared to the other, older, M3s that were there. He speculated, although who knows for sure, that BMW must have changed something for 2011. I'm not convinced they did but my exhaust is notably deeper and louder. It has actually taken away the exhaust upgrade bug I had with the last M3.

they should be identical. I had 2009 E92 m3 and now 2011 E93 m3, they sound exactly the same. Maybe not noticeable